draw.h

在x86平台上运行不可信任代码的sandbox。

	/* deltas */
	DSUBF = 	4,
	/* expiry ages */
	SUBFAGE	=	10000,
	CACHEAGE =	10000
};

struct Cachefont
{
	Rune		min;	/* lowest rune value to be taken from subfont */
	Rune		max;	/* highest rune value+1 to be taken from subfont */
	int		offset;	/* position in subfont of character at min */
	char		*name;			/* stored in font */
	char		*subfontname;		/* to access subfont */
};

struct Cacheinfo
{
	ushort		x;		/* left edge of bits */
	uchar		width;		/* width of baseline */
	schar		left;		/* offset of baseline */
	Rune		value;	/* value of character at this slot in cache */
	ushort		age;
};

struct Cachesubf
{
	ulong		age;	/* for replacement */
	Cachefont	*cf;	/* font info that owns us */
	Subfont		*f;	/* attached subfont */
};

struct Font
{
	char		*name;
	Display		*display;
	short		height;	/* max height of image, interline spacing */
	short		ascent;	/* top of image to baseline */
	short		width;	/* widest so far; used in caching only */	
	short		nsub;	/* number of subfonts */
	ulong		age;	/* increasing counter; used for LRU */
	int		maxdepth;	/* maximum depth of all loaded subfonts */
	int		ncache;	/* size of cache */
	int		nsubf;	/* size of subfont list */
	Cacheinfo	*cache;
	Cachesubf	*subf;
	Cachefont	**sub;	/* as read from file */
	Image		*cacheimage;
};

#define	Dx(r)	((r).max.x-(r).min.x)
#define	Dy(r)	((r).max.y-(r).min.y)

/*
 * One of a kind
 */
extern int		mousescrollsize(int);

/*
 * Image management
 */
extern Image*	_allocimage(Image*, Display*, Rectangle, ulong, int, ulong, int, int);
extern Image*	allocimage(Display*, Rectangle, ulong, int, ulong);
extern uchar*	bufimage(Display*, int);
extern int	bytesperline(Rectangle, int);
extern void	closedisplay(Display*);
extern void	drawerror(Display*, char*);
extern int	flushimage(Display*, int);
extern int	freeimage(Image*);
extern int	_freeimage1(Image*);
extern int	geninitdraw(char*, void(*)(Display*, char*), char*, char*, char*, int);
extern int	initdraw(void(*)(Display*, char*), char*, char*);
extern int	newwindow(char*);
extern Display*	initdisplay(char*, char*, void(*)(Display*, char*));
extern int	loadimage(Image*, Rectangle, uchar*, int);
extern int	cloadimage(Image*, Rectangle, uchar*, int);
extern int	getwindow(Display*, int);
extern int	gengetwindow(Display*, char*, Image**, Screen**, int);
extern Image* readimage(Display*, int, int);
extern Image* creadimage(Display*, int, int);
extern int	unloadimage(Image*, Rectangle, uchar*, int);
extern int	wordsperline(Rectangle, int);
extern int	writeimage(int, Image*, int);
extern Image*	namedimage(Display*, char*);
extern int	nameimage(Image*, char*, int);
extern Image* allocimagemix(Display*, ulong, ulong);

/*
 * Colors
 */
extern	void	readcolmap(Display*, RGB*);
extern	void	writecolmap(Display*, RGB*);
extern	ulong	setalpha(ulong, uchar);

/*
 * Windows
 */
extern Screen*	allocscreen(Image*, Image*, int);
extern Image*	_allocwindow(Image*, Screen*, Rectangle, int, ulong);
extern Image*	allocwindow(Screen*, Rectangle, int, ulong);
extern void	bottomnwindows(Image**, int);
extern void	bottomwindow(Image*);
extern int	freescreen(Screen*);
extern Screen*	publicscreen(Display*, int, ulong);
extern void	topnwindows(Image**, int);
extern void	topwindow(Image*);
extern int	originwindow(Image*, Point, Point);

/*
 * Geometry
 */
extern Point		Pt(int, int);
extern Rectangle	Rect(int, int, int, int);
extern Rectangle	Rpt(Point, Point);
extern Point		addpt(Point, Point);
extern Point		subpt(Point, Point);
extern Point		divpt(Point, int);
extern Point		mulpt(Point, int);
extern int		eqpt(Point, Point);
extern int		eqrect(Rectangle, Rectangle);
extern Rectangle	insetrect(Rectangle, int);
extern Rectangle	rectaddpt(Rectangle, Point);
extern Rectangle	rectsubpt(Rectangle, Point);
extern Rectangle	canonrect(Rectangle);
extern int		rectXrect(Rectangle, Rectangle);
extern int		rectinrect(Rectangle, Rectangle);
extern void		combinerect(Rectangle*, Rectangle);
extern int		rectclip(Rectangle*, Rectangle);
extern int		ptinrect(Point, Rectangle);
extern void		replclipr(Image*, int, Rectangle);
extern int		drawreplxy(int, int, int);	/* used to be drawsetxy */
extern Point	drawrepl(Rectangle, Point);
extern int		rgb2cmap(int, int, int);
extern int		cmap2rgb(int);
extern int		cmap2rgba(int);
extern void		icossin(int, int*, int*);
extern void		icossin2(int, int, int*, int*);

/*
 * Graphics
 */
extern void	draw(Image*, Rectangle, Image*, Image*, Point);
extern void	drawop(Image*, Rectangle, Image*, Image*, Point, Drawop);
extern void	gendraw(Image*, Rectangle, Image*, Point, Image*, Point);
extern void	gendrawop(Image*, Rectangle, Image*, Point, Image*, Point, Drawop);
extern void	line(Image*, Point, Point, int, int, int, Image*, Point);
extern void	lineop(Image*, Point, Point, int, int, int, Image*, Point, Drawop);
extern void	poly(Image*, Point*, int, int, int, int, Image*, Point);
extern void	polyop(Image*, Point*, int, int, int, int, Image*, Point, Drawop);
extern void	fillpoly(Image*, Point*, int, int, Image*, Point);
extern void	fillpolyop(Image*, Point*, int, int, Image*, Point, Drawop);
extern Point	string(Image*, Point, Image*, Point, Font*, char*);
extern Point	stringop(Image*, Point, Image*, Point, Font*, char*, Drawop);
extern Point	stringn(Image*, Point, Image*, Point, Font*, char*, int);
extern Point	stringnop(Image*, Point, Image*, Point, Font*, char*, int, Drawop);
extern Point	runestring(Image*, Point, Image*, Point, Font*, Rune*);
extern Point	runestringop(Image*, Point, Image*, Point, Font*, Rune*, Drawop);
extern Point	runestringn(Image*, Point, Image*, Point, Font*, Rune*, int);
extern Point	runestringnop(Image*, Point, Image*, Point, Font*, Rune*, int, Drawop);
extern Point	stringbg(Image*, Point, Image*, Point, Font*, char*, Image*, Point);
extern Point	stringbgop(Image*, Point, Image*, Point, Font*, char*, Image*, Point, Drawop);
extern Point	stringnbg(Image*, Point, Image*, Point, Font*, char*, int, Image*, Point);
extern Point	stringnbgop(Image*, Point, Image*, Point, Font*, char*, int, Image*, Point, Drawop);
extern Point	runestringbg(Image*, Point, Image*, Point, Font*, Rune*, Image*, Point);
extern Point	runestringbgop(Image*, Point, Image*, Point, Font*, Rune*, Image*, Point, Drawop);
extern Point	runestringnbg(Image*, Point, Image*, Point, Font*, Rune*, int, Image*, Point);
extern Point	runestringnbgop(Image*, Point, Image*, Point, Font*, Rune*, int, Image*, Point, Drawop);
extern Point	_string(Image*, Point, Image*, Point, Font*, char*, Rune*, int, Rectangle, Image*, Point, Drawop);
extern Point	stringsubfont(Image*, Point, Image*, Subfont*, char*);
extern int		bezier(Image*, Point, Point, Point, Point, int, int, int, Image*, Point);
extern int		bezierop(Image*, Point, Point, Point, Point, int, int, int, Image*, Point, Drawop);
extern int		bezspline(Image*, Point*, int, int, int, int, Image*, Point);
extern int		bezsplineop(Image*, Point*, int, int, int, int, Image*, Point, Drawop);
extern int		bezsplinepts(Point*, int, Point**);
extern int		fillbezier(Image*, Point, Point, Point, Point, int, Image*, Point);
extern int		fillbezierop(Image*, Point, Point, Point, Point, int, Image*, Point, Drawop);
extern int		fillbezspline(Image*, Point*, int, int, Image*, Point);
extern int		fillbezsplineop(Image*, Point*, int, int, Image*, Point, Drawop);
extern void	ellipse(Image*, Point, int, int, int, Image*, Point);
extern void	ellipseop(Image*, Point, int, int, int, Image*, Point, Drawop);
extern void	fillellipse(Image*, Point, int, int, Image*, Point);
extern void	fillellipseop(Image*, Point, int, int, Image*, Point, Drawop);
extern void	arc(Image*, Point, int, int, int, Image*, Point, int, int);
extern void	arcop(Image*, Point, int, int, int, Image*, Point, int, int, Drawop);
extern void	fillarc(Image*, Point, int, int, Image*, Point, int, int);
extern void	fillarcop(Image*, Point, int, int, Image*, Point, int, int, Drawop);
extern void	border(Image*, Rectangle, int, Image*, Point);
extern void	borderop(Image*, Rectangle, int, Image*, Point, Drawop);

/*
 * Font management
 */
extern Font*	openfont(Display*, char*);
extern Font*	buildfont(Display*, char*, char*);
extern void	freefont(Font*);
extern Font*	mkfont(Subfont*, Rune);
extern int	cachechars(Font*, char**, Rune**, ushort*, int, int*, char**);
extern void	agefont(Font*);
extern Subfont*	allocsubfont(char*, int, int, int, Fontchar*, Image*);
extern Subfont*	lookupsubfont(Display*, char*);
extern void	installsubfont(char*, Subfont*);
extern void	uninstallsubfont(Subfont*);
extern void	freesubfont(Subfont*);
extern Subfont*	readsubfont(Display*, char*, int, int);
extern Subfont*	readsubfonti(Display*, char*, int, Image*, int);
extern int	writesubfont(int, Subfont*);
extern void	_unpackinfo(Fontchar*, uchar*, int);
extern Point	stringsize(Font*, char*);
extern int	stringwidth(Font*, char*);
extern int	stringnwidth(Font*, char*, int);
extern Point	runestringsize(Font*, Rune*);
extern int	runestringwidth(Font*, Rune*);
extern int	runestringnwidth(Font*, Rune*, int);
extern Point	strsubfontwidth(Subfont*, char*);
extern int	loadchar(Font*, Rune, Cacheinfo*, int, int, char**);
extern char*	subfontname(char*, char*, int);
extern Subfont*	_getsubfont(Display*, char*);
extern Subfont*	getdefont(Display*);
extern void		lockdisplay(Display*);
extern void	unlockdisplay(Display*);
extern int		drawlsetrefresh(ulong, int, void*, void*);

/*
 * Predefined 
 */
extern	uchar	defontdata[];
extern	int		sizeofdefont;
extern	Point		ZP;
extern	Rectangle	ZR;

/*
 * Set up by initdraw()
 */
extern	Font		*font;
extern	int	_cursorfd;
extern	int	_drawdebug;	/* set to 1 to see errors from flushimage */
extern	void	_setdrawop(Display*, Drawop);

#define	BGSHORT(p)		(((p)[0]<<0) | ((p)[1]<<8))
#define	BGLONG(p)		((BGSHORT(p)<<0) | (BGSHORT(p+2)<<16))
#define	BPSHORT(p, v)		((p)[0]=(v), (p)[1]=((v)>>8))
#define	BPLONG(p, v)		(BPSHORT(p, (v)), BPSHORT(p+2, (v)>>16))

/*
 * Compressed image file parameters and helper routines
 */
#define	NMATCH	3		/* shortest match possible */
#define	NRUN	(NMATCH+31)	/* longest match possible */
#define	NMEM	1024		/* window size */
#define	NDUMP	128		/* maximum length of dump */
#define	NCBLOCK	6000		/* size of compressed blocks */
extern	void	_twiddlecompressed(uchar*, int);
extern	int	_compblocksize(Rectangle, int);

/* XXX backwards helps; should go */
extern	ulong	drawld2chan[];
extern	void		drawsetdebug(int);